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Senior Core Physics and Radiation Protection Engineer

Job in 1000, Amsterdam, North Holland, Netherlands
Listing for: Thorizon’ group
Full Time position
Listed on 2026-07-22
Job specializations:
  • Engineering
    Research Scientist, Systems Engineer, Software Engineer, Mechanical Engineer
Salary/Wage Range or Industry Benchmark: 70000 - 90000 EUR Yearly EUR 70000.00 90000.00 YEAR
Job Description & How to Apply Below

Your mission

Are you passionate about core physics, radiationprotectionand criticality?

Are you motivated to apply yourexpertiseandknow-howto the ongoing design studies for the Thorizon One reactor?

Are you passionate about designingcutting-edgeneutronicssystems and solving complex engineering challenges?

Do you get energized when working oninnovative solutions?

You will be a major contributorofthecore physics, radiation protection, and criticalityexpertisecenter, whose primary missions are, on the one hand, to provide comprehensive support and expertise in this area to the system design teams incharge of thefuel cycle, thereactordesign and safety studies and, on the other hand, to define, execute, and adapt where needed the validation programusingexperiments carried out through shared initiatives, designed to ultimately prove that the innovations in our solution are feasible within the performance, cost, and time constraints of our project.

Within this general frameworkyou will develop methods and tools to performcore physics, radiationprotectionand criticalitystudies,possibly in collaboration with external specialists, performhigh qualitystudies with the appropriate computationaltools, andvalidatethe computational tools. In your role, you can carry out an analysis to meet anycore physics, radiationprotectionand criticalityneeds for Thorizon projects (Pioneer nuclear demonstrator design, FOAK/NOAK design), including budget, planning, tools selection, calculations, report issuance. You interacteasily with other areas of expertise (such as nuclear safety,thermal-hydraulics,chemistryand mechanics).

Your level ofexpertiseallows you to prioritize based on the importance of the needs, and as an expert, you have the power to recommend any necessary actions for the project related to your area of expertise. Furthermore, youparticipatein external networks, including international initiatives, to stay at the forefront of industry developments. In this environment, you get the unique opportunity toput your knowledge to the best use,develop your ideas,andexplore various aspects of thermal-hydraulics engineering.

This role is based in Amsterdam, Netherlands or in Lyon, France.

In this role you will:
  • Set up an effective core physics computational train, using both probabilistic(MCNP, SERPENT for example) and deterministic approaches(APOLLO3, SCALE for example), as well asprovidingnumerical/physicalinsights and practical approachestoestablishappropriatecouplingwiththermal-hydraulicsfor effective transient analyses.
  • Set up core radiation protection or criticality models for simulation of shutdown, storage,handling and transport
  • Set up andmaintainscientific computing environments on Linux, including installing and configuring scientific software, libraries, and data analysis tools.
  • Automate the studies and their pre- and post-processing.
  • Contribute to definition and justification of the safety case.
  • Contribute to orestablisheffectiveexchangewith other codes and results from other disciplines, such as thermal-hydraulics, salt compositionchemistryand structural mechanics.
  • Participate in specifying, selecting, and managing external contractors and suppliers that support the project.
  • Guide junior colleagues in the samediscipline, andshare your knowledge with your teammates.
  • Create transparency on development progress,identify issues and challenges,andpropose solutions that will help team problem-solving and designiteration.
  • Implement a learning loop and ensure lessons learned are systematicallyintegrated in way of working and the design itself.
  • Contribute to the definition, execution, and adaptationwhere neededofthe validation programusingexperiments, designed to ultimately provethat the innovations in our solution arefeasiblewithin the performance, cost, and time constraints of our project. This program includes thequalificationof thecore physics, radiationprotectionand criticality

    Computational Tools to be used for design and safety, applying national (e.g., ASNR guide 28) or international (IAEA in particular) approaches.
  • Participate in meetings with regulators with the aim of defending in-house positions and contribute tomaintainingan active dialogue with regulators (in particular ASNR, ANVS and FANC).
  • Be involved in various international initiatives (IAEA, Euratom…) dedicated toyourdiscipline.
  • Stay updated on industry trends and advancements in approaches, methodologies,Computational Tools incore physics, radiationprotectionand criticality.
  • Report tothe Core Physicslead, andworkin different project teams.
About you:
  • You have a master’sdegreeor a PhDin science or engineering, experience in the nuclear field is mandatory.
  • You have minimum 8 years of proven experience in core physics,radiation protectionandcriticalitysimulations and analyses. A PhD is regardedasworkexperience, ifthe subject of study is relevant to the job position.
  • You have experience withmultidisciplinarycode couplingfrom the fundamental data tothereal worldapplicationand (simulation)…
Position Requirements
10+ Years work experience
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